Asymmetric construction of phosphono dihydropyranones from α-ketophosphonates enabled by Pd/chiral isothiourea relay catalysis
作者:Mostafa Sayed、Zhipeng Shi、Zhi-Yong Han、Liu-Zhu Gong
DOI:10.1039/d3ob01267k
日期:——
the synthesis of chiral phosphono dihydropyranones. This approach is enabled by Pd/chiral isothiourea relay catalysis under mild reaction conditions, starting from readily available benzyl bromides, CO, and α-ketophosphonates. The cascade reaction involves the generation of a ketene intermediate from Pd-catalyzed carbonylation of benzyl bromide and subsequent chiral Lewis base catalyzed formal [4 +
已经开发出一种高度对映和非对映选择性的方法来合成手性膦酰基二氢吡喃酮。这种方法是通过 Pd/手性异硫脲中继催化在温和的反应条件下实现的,从容易获得的苄基溴、CO 和 α-酮膦酸酯开始。该级联反应涉及由钯催化的苄基溴的羰基化生成乙烯酮中间体以及随后的手性路易斯碱催化的形式[4 + 2]反应。膦内酯产品还可以转化为手性1,5-二酯产品,收率好,立体选择性高。